Im not sure what to even label my failure on the range today, so I am calling it a ‘catastrophic’ jam till someone corrects me! Further, this was due to my carelessness, I think.

I was doing load development this week and was on the range today again. My load was over press by quite a bit …. see attachment #1

My gas system was very much overgassed. To the point where my cases were being dented at the mouth by the brass defector …. see #3 attachment.

The result was a case jammed that I could not get to extract at the range and had to take my AR apart to finally get the spent case out of the chamber …. see attachment #2. Does the case remind you of other images of  6mm ARC cases people have posted?

I think that the banding we have seen occasionally is due to overgassed ARs with a hot load. The over gassing causes the case to start extracting too soon. What do you think?

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Bought a used Uintah Precision bolt action upper that fits on AR-15 lowers. It has a 22 inch barrel and came with about 2000 rounds shot and still shoots very good. Right now I use it on a Diamondback Firearms lower from my 300blk, that is my primary deer gun. I bought an Arken SH-4 4-16X50 GEN2 to go on top. The plan is put together a 16 or 18 inch AR upper and build out a precision lower for them to share. This setup is primarily for the range but got some 103gr Elite Hunters to use on deer, hogs and hopefully some coyotes I have around.

All lengths of our REXUS brand 6mm ARC AR15 barrels are now in stock and ready to ship:

6mm ARC 12" CLGS in our Alpha field profile

6mm ARC 14.5" MLGS Alpha profile

6mm ARC 16" MLGS Alpha profile

6mm ARC 18" RLGS Alpha profile

6mm ARC 18" RLGS in our Bravo heavier marksman profile

6mm ARC 20" RLGS Alpha profile

6mm ARC 20" RLGS Bravo profile


• Barrels are tough 41V50 steel with a weather-proof black nitride surface treatment

• Rifling is our proprietary 5R profile which creates minimal bullet engraving for maximum accuracy potential

• Twist rate is 1:7 to properly stabilize the longest 6mm bullets in the shortest barrels in the most extreme conditions

• Barrel profile features a thicker "bull" section near the chamber to provide strength, reduce barrel whip, and promote balance for ease of handling

• While maintaining SAAMI-spec, chamber design prevents "magnum" case bulging and throat allows seating to 2.280 for maximum powder capacity

• Chambers headspaced for Type 2 (we call them Mk136) 6.5 Grendel/6mmARC bolts with a boltface counterbore depth of .136" — our REXUS UltraBolt is the industry standard for engineering refinement at a competitive price!


See them all, and more, at SixFiveOutfitters.com.

HOWA M1500 6MM ARC, 20" MINI ACTION ADJ STOCK

New in box 
never fired
Images on request
Located in Raleigh, NC

$525

anyone having any problems with starline brass with top level loads, my 1X fired brass are pretty much junk after resizing.
on the left is a 3X fired Hornady, right is 1X fired starline with the same load. look just above the rim.

Just bot a Howa 1500 in 6mm ARC. Im a bit disappointed.  The chassis on it is cheap plastic and really needs to be replaced. So, Im planning on purchasing an aftermarket chassis. I was considering this MDT https://mdttac.com/lss-xl-gen2-chassis-system any other good choices? 

In addition to the stock chassis being low quality, the magazines do not seem particularly good. Im assuming that the mag below will fit the LSS-XL gen2 chassis, right?

https://themagshack.com/shop/rifle-magaz...-magazine/

Th description says the mag is for short action, but the 6mm ARC is the mini action! Im confused ?

The 6ppc set the gold standard for short range benchrest. But if you look at the 6mm arc or the 6mm max , both of these will easily exceed 3000 fps with a 68, 70, 75 gr projectile. Will a heavier projectile with a higher BC set the new gold standard? A flat base 90 or 95 gr or heavier in a benchrest platform? What’s your thoughts..

Been looking for some load development info for the Barnes 112Gr. Matchburner. G1 BC .624
Ar15 platform 20" Ballistic Advantage 1-7 barrel. Loaded to mag length max. 
Most of what I have loaded is in the 90-108gr range and using LVR, TAC, and Varget.
Shooter's reference has some loads for 110gr. AMax, just thought I would be a troll and see if anyone has experimented with them.
Thanks to all who respond in advance!

For those that load Hammer bullets. When shooting the 87gr AH does it matter if you crimp or not . 
In my bolt gun, with the AH having less friction would there be a chance of the bullet moving with out a crimp ?

Thanks

I just started playing around with the 6 mm arc. I’m trying to expand my knowledge on this and what the rest of the world is experiencing. 
Do you have any favorite You Tube channels or similar sites that have trusted information? Currently I enjoy Ultimate Reloader and Johnnys Reloading Bench. How about you?